"War comes to Coulson's doorstep in a way he never anticipated as shocking revelations are brought to light, and Skye struggles to control her new abilities but will soon make a decision that irrevocably changes her life."
So we find out that the cabin where Coulson locked up Skye was designed and built by Bruce Banner aka The Hulk himself as a place to keep himself locked up. Wow, Coulson must really think she is a threat if her locked her up in a Hulk level prison. Bobbi helps the "other Shield" take over and captures everybody but Skye, who escapes off with that weird no eyes teleporter. Of course I think Bobbi will start to regret helping OS after seeing how "Ramse" (whatever his name is on Shield, I have no idea) tries to kill Skye. Of course Coulson is freed and gets away thanks to May, and Fitz-Simmons appear to be working for OS, but you know they will help Coulson as soon as he pops back up.